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47 lines
1.3 KiB
PHP
47 lines
1.3 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\caching;
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use Yii;
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use yii\base\InvalidConfigException;
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/**
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* FileDependency represents a dependency based on a file's last modification time.
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*
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* If th last modification time of the file specified via [[fileName]] is changed,
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* the dependency is considered as changed.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class FileDependency extends Dependency
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{
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/**
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* @var string the file path or path alias whose last modification time is used to
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* check if the dependency has been changed.
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*/
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public $fileName;
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/**
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* Generates the data needed to determine if dependency has been changed.
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* This method returns the file's last modification time.
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* @param Cache $cache the cache component that is currently evaluating this dependency
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* @return mixed the data needed to determine if dependency has been changed.
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* @throws InvalidConfigException if [[fileName]] is not set
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*/
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protected function generateDependencyData($cache)
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{
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if ($this->fileName === null) {
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throw new InvalidConfigException('FileDependency::fileName must be set');
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}
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return @filemtime(Yii::getAlias($this->fileName));
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}
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}
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